html {
  background-color: black;
  background-image: 
  linear-gradient(45deg, rgba(255,255,255,.3) 70px, transparent 1px),
  linear-gradient(45deg, rgba(255,255,255,.2) 35px, transparent 1px),
  linear-gradient(45deg, rgba(255,255,255,.1) 17.5px, transparent 17.5px),
  linear-gradient(0deg, rgba(255,255,255,.2) 100px, transparent 1px);
  background-size: 100px 100px, 50px 50px, 25px 25px, 100px 100px;
  background-position: -2px -2px, -1px -1px, -.5px -.5px, auto;
  box-sizing: border-box;
  padding-left: 10%;
  padding-right: 10%;
}

body {
  box-sizing: border-box;
  height: 100%;
  background-color: white;
  margin: 0;
  padding: 0;
}

#main {
  box-sizing: border-box;
  width: 100%;
  padding: 20px;
  margin: 0;
}